Andy Green wrote:
On a capture of a broadcast which I believe was at 54Mbps, I see the
PRISM2 / ieee80211_frame_info field "datarate" is set to 0xf0, or 240
decimal. I looked around at the various different ways of talking about
tx rate in the stack and drivers, but none that I found use 0xf0 for
54Mbps. Is it 48Mbps in units of 200kHz? Or 54Mbps in units of 225kHz
(!!) Or...?
I am trying to reissue this captured packet using the management
interface (which I can now conjure up) with a rate that I can control,
but I did not find any information on the coding for this field.
Well, I discover in fact you need to inject starting only from the
IEEE802.11 header... and indeed that does work if you do it on the
"Management Interface". I found this from hostapd sources, since
wpa_supplicant doesn't seem to inject packets from userspace, it seems
to trigger the stack to do canned packets by a huge range of IOCTLs. So
I have unencrypted packets in both directions now without patching
anything on the kernel side :-D But, there is a but...
The packet seems to go out at a default rate, in my case 1Mbps. Is
there in fact a method for requesting the rate for injected packets, or
is there at the moment a simple equivalence that all broadcasts will go
out at 1Mbps?
-Andy
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